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Ethernaut WriteUp
In this challenge: 12-privacy
arg1
is 0x03, var0
is 0x02, so storage[var0 + arg1]
refers to 0x05 slot. As it's 0-indexed, I think it's the sixed slot, but you said it's fifth slot.
In contract source code, variabilities :
bool public locked = true; // first slot
uint256 public ID = block.timestamp; // second slot
uint8 private flattening = 10; // third slot
uint8 private denomination = 255; // third slot
uint16 private awkwardness = uint16(now); // third slot
bytes32[3] private data; // forth, fifth, sixth, seventh slot
And in unlock
function:
function unlock(bytes16 _key) public {
require(_key == bytes16(data[2]));
locked = false;
}
That's why bytes16(data[2])
refer to the first 16 bytes of the sixth slot.
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